George a



(No Model.)

G. A. GRAY.

METAL PLANING MACHINE.

NG. 419,437. Patented Jan. 14, 1890.

11st In:

Witnesses Inventor 6( 0' WM5 W' Attorney UNITED STATES A PATENT OFFICE.

GEORGE A. GRAY, OF CINCINNATI, OHIO, ASSIGNOR TO THE G. A. GRAY COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 419,437, dated January 14, 1890.

Application filed October 28, 1889. Serial No. 328,496. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. GRAY, of Cincinnati, Hamilton county, Ohio, have vinvented certain new and useful Improvements in Metal-Flaming Machines, of which the following is a specification.

This invention pertains to improvements in the shifting apparatus of metal-planing machines, and will be readily understood from ythe following description, taken in connection with theaccompanying drawings, in which- Figure l is a side elevation of a planer eX- emplifying my improvements, the usual rail and its attachments being omitted as not necessary to an understanding of my improvement; Fig. 2, a side elevation, upon an enlarged scale, of the tumbler and dogs; Fig. 3, a front elevation of the tumbler and dogs.

In the operation of planing-machines the operator often desires to allow the Work to back out quite a distance, so as to be readily inspected. To do this he usually loosens the back dog, and he must readj ust this back dog to restore the planer to Working-stroke. Sometimes a flip has been added to the back dog, so that the dog could be made to pass the tumbler without operating the tumbler; but there is a tendency in modern construction to make the table run back at very high speed,

and under such circumstances any manipu` lation of the back dog, or of a flip attached to it, While the table is in motion becomes a very risky and uncertain operation. A turnover piece of flip has in some cases been attached to the tumbler, by means of which the tumbler could be virtually suppressed when desired.' The defect in this device restsvin the fact, irst, that it acts to suppress the tumbler as regards both dogs, and, second, that the flip requires restoration by hand. In my improved device the tumbler is provided with a flip which, being manipulated by hand, virtually suppresses the tumbler so far as the back dog is concerned, the iip automatically restoring itself to position.

In the drawings, A indicates the bed of the planer; B, the table; C, the front dog, or the dog which acts on the tumbler at the end of the cutting-stroke and eifects the reversal of the table motion, both dogs being adjustable along the edge of the table, as usual; D, the

late it; F, the ordinary connection by means,

of which the tumbler transmits motion to the belt-shifting apparatus; G, the hand-piece of the tumbler, to serve as a means by which the tumbler may be oscillated by the operative independent of the dogs; I-l, a rigid lug upon the tumbler, arranged to be lstruck by the front dog C, this lug in the exempliiication projecting from the rear of the tumbler in the usual manner, the arrangement being such, as usual, that the front dog passes to the rear -of the tumbler and engages the lug H and oscillates the tumbler to the right and shifts the belt or belts to arrest the cutting motion of the table and install the backing motion;

J, a pawl or ip pivoted to the tumbler and presenting itself in position to be struck by the back dog B, this flip having a counterbalancing-tail Whose weight tends to maintain the iiip in normal position to be engaged by the back dog; K, a stop on the tumbler, engaged by the tail of the flip when the flip is in normal position; L, a stop on the tumbler to limit the swinging of the flip upon its pivot, and M the tail of the flip. y

Under ordinary conditions the upper end of the flip acts in the usual manner as a rigid tooth on the tumbler. The back dog will engage this tooth and oscillate the tumbler to the left and operate the belt-shifting apparatus to arrest the backing motion and 'install the cutting mot-ion. When the back dog strikes the ip, the tendency of the ip is to oscillate on its pivot, but the stop K prevents any such oscillation; but if the operative desires the table to back beyond the normal point he. will press the flip-tail M to the left. The upper end of the iiip is thus moved out of the path of the back dog and the table'can move back until the belt motion is reversed by operating the tumbler by hand. As soon as the back dog has passed the tumbler the `operative moves his hand from the lip-tail and its weight immediately restores it to normal position against the stop K. On the rcturn-trip of the table the back dog will come in Contact with the non-Working side of the upper end of the tlip, but the flip will yield by oscillating on its pivot, and the dog will thus ride over the iiip, which, after the passage of the dog, Will automatically restore` itself to normal position, the riding of the back dog over the tlip having no eiect to operate the belt-shitting.

The object of the stop L is merely to put a reasonable limit to the movement of the flip when the operative tips it to non-Workin g position. This stop is not essential, though desirable.

The device is very simple and very efficient and permits of ready use with planers arranged for the highest modern rates of backing speed.

I claim as my invention- I. In a planing-machine, the combination, substantially as setfortl1,with a bed, a table, a front dog, a back dog, and a belt-shifting connection to be operated through the medium of a tumbler, of a tumbler connected with such belt-shifting connection and arranged to be engaged by the front dog, and a flip or pawl pivoted to the tumbler and arranged to be engaged by the back dog on the backingstroke of the table, so as to eifect a proper movement of the tumbler and to be pushed out of the path of the back dog Without moving the tumbler when the back dog engages the flip or pawl at the cutting-stroke of the table.

2. In a planing-maehine, the combination, substantially as set forth, with a bed, a table, a front dog, a back dog, and a belt-shifting connection to be operated by means of a tumbler, of a tumbler engaged by such belt-shifting connection and arranged to be moved by said dogs, a llip or pawl pivoted to said tumbler and presenting itself in the path of the baek dog, and provided with a eounterbalancing-tail engaging a stop on the tumbler and serving to maintain the flip or pawl in normal position to be engaged by the back dog on the backingstroke of the table, and

arranged to be turned on its pivot so as not to be engaged by the back dorf.

3. In a planing-machine, the combination, substantially as set forth, with a bed, a table,` a front dog, a back dog, and a belt-shifting connection to be operated by a tumbler, of a tumbler pivoted to the bed and vertically disposed, and provided with a lug to be engaged by the front dog on the cutting-stroke of the table, and provided Wit-h a stop, a flip or pawl pivoted to the tumbler and presenting itself in the path of the back dog, and provided with a tail engaging said stop on the tumbler, and adapted to be moved away from said stop by hand or to be moved away from it automaticallyby the action of the back dog on the cutting-stroke of the table.

GEORGE A. GRAY.

lVitnesses:

AnoLrn ZUEs'r, ADoLrI-r RICHTER. 

